selenium-ide-for-chrome

In a Nutshell, selenium-ide-for-chrome...

• ...
  has had 21 commits made by 3 contributors
  representing 6,606 lines of code
• ...
  is mostly written in JavaScript
  with a very well-commented source code
• ...
  has a young, but established codebase
  maintained by nobody
  with stable Y-O-Y commits
• ...
  took an estimated 2 years of effort (COCOMO model)
  starting with its first commit in October, 2012
  ending with its most recent commit almost 11 years ago